Machine for threading the points of lag-screws



(No Model.)

` 2 Sheets-Sheet 1.`

H. E. GUY.

MACHINE FDR THREADING THE'POINTS OP LAG SUREWS. No. 276,671.A Patented May 1,1883.V

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H. E. GOY. MACHINE OR THREADING THE POINTS OF LAG SCREWS.

No. 276,671.'I Patented May 1,188.3.

Mmmm) y UNITED STATE-s PATENT OFFICE.

HENRY E. OOY, OF MANSFIELD, OHIO.

MACHINE FOR THREADING THE POlNTS OF LAG-SCREWS.

SPECIFICATION' forming part of Letters` Patent No. 276,671, dated May 1, 1883.

Applicationnledoetonria,1882. (Nomadi-.1.)

To all whom it may concern Be it known that I, HENRY E. (JOY, a citizen of the United States, residing at Manstield, in the county ot Richland and State of Ohio, have invented certain new and useful Improvements in Machines for Threading the VPoints ot' Lag-Screws; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains i to make and use the same.

The invention relates to an improvement in machines for cutting threads on the points of lag bolts or screws. In the process of manufacturinglag-bolts the shank of thesame is of uniform diameter, and is provided with the usual spiral thread, the pointof the holt being left blank.

The object ot' the present invention is to thread this point so that it may be made to en ter wood or other material Without iirst preparing a hole to receive it; and it (the invention) consists of the elements hereinafter described, and particularly pointed out in the claims. l

The exact nature and advantages of the invention will be readily understood from the detailed description hereinafter presented, reference being had to the accompanying drawings, in which- Figure lis a top view of a machine embodying the elements ofthe invention. Fig. 2 is a side view of the same. Fig. 3 is an end view of the clamping-heads and operating-lever,

made on the line y y ot'` Fig. 1, looking` in the direction of the arrow; andFig. 4 is an end view of the head carrying the tools for cutting the thread, made on the line or a', and looking in the direction ot'. the arrow. Fig. 5 is a vertical transverse section through the small wheels t' t and the blocks Q. In the drawings, A denotes the head which imparts the revolving lnotionto the screw to be cut. This head consists of two standards, a. a, in which is jourualed the shaft B, having the usual feather upon its surface, which; enters a groove formed in the cone-shaped clutch b, and supplied upon its front end with the screw-holder C, asindicated in the drawings. D indicates the belt-wheel, which is placed loosely upon the shaft B and in juxtaposition to the cone-shaped clutch b, which latter is operated to en ter or recede from the belt-wh eel D by means of the lever d. Thus, when I desire the machine to remain at rest Without stopping the power, I throw the clutch b away from contact with the belt-wheel D; and when it is desired to start the machine again the clutch b is made to enter the wheel ll), under der which conditions the motion will he communicated to the shaft B and its connections.

The screw to be treated has its head inserted in the screw-holder C, the body ofthe screw projecting forward on a horizontal plane. The screw-holder will be a metallic piece fitted on the shaft B, and having a head or pocket adapted to receive the headof the screw.

Upon the baseE, which supports the head A, is also placed the head F, which is arranged in advance ofthe head A, and carries the screwclam piu g parts and the tools f or threading the A point on the screw, together with mechanism which will be described hereinafter. The head F consists of a base, G, adjustably secured to the hase E by the screw d', having a head upon each end, the head on the lower end iitting in the groove e, and the head of the upper end penetrating the lower part, f, of the base G. The hase Gf may be secured in any set .position upon the base E by the bolt d', and is provided upon opposite sides with the standards H, upon the-upper ends of which are pivotally secured the cam-levers I, one hein g on the upper end of each standard.

Upon the upper ends of the standards also are pivotally secured the. arms l1, which are pulled by springs toward the outer ends of the cam-levers I, the purpose of which will he explained more fully in the following description. The edges ot' the part fof base Gare cut to form guides for the auxiliary base J, which slides thereon.

Upon the outer end of the base .I is formed the transverse guide K, upon which the two standards L have a transverse sliding movement toward or from each other, according as they are acted upon by the cams m out in the plate M, which is operated by the lever Y.

Upon each of the standards L is a pin, a, which enters the cams m, and communicates the movement influenced bythe cams to the standards L.

In the upper portion of the standards L, preferably at theirupper inner corners, are secured the sections O, forming the screw-clamp. This clamp is made in two sections and mounted upon the movable standards L, so that they may be separated, the screw inserted, and then closed upon the same. The interior of the screw-clamp O will be provided with a female thread corresponding with the thread upon the screw the point of which is to be threaded, so that as motion is imparted to the machine and is communicated to the screw it will feed the sliding base J, carrying the pointthreading tools, by meshing with the thread in the screw-clamp.

The standards L are recessed at I), as indicated, in which recesses are placed the trailsverselysliding blocks Q, upon which are secured by set-screws or other suitable means the point-threading tools It. The blocks Q have a tendency to ily outward from each other when they have been moved toward each other during the operation of the machine. One of the blocks Q is shorter than the other block, whereby one of the point-threading tools is lower than the other. One of the point-threading tools is placed with its longer point downward and the other with its longer point uppermost, whereby when the two points -are brought against the screw to be treated they will make the proper incision.

Upon vthe outer sides of the sliding blocks Q are secured, between suitable lugs or ears, the small friction-wheels t, which, as the sliding base J, carrying the screw-clamp O and point-threading tools, is moved on the part f of base G, will bear against the inclined surfaces of the pivotally-secured cam-levers I. The front ends of the levers I project inward beyond their rear ends, so that when the base J, carrying the point-threadin g tools, is moved forward the wheels t will be pressed inward by the projecting surfaces of the levers I, and in turn will cause the blocks Q, carrying the point-threading tools, to advance toward each other, bringing the tools nearer each other, so as to thread the end of the screw being manipulated. After the wheels t have reached the forward ends of the levers I, the blocks Q will strike the ends of the arms h, forcing them outward, and permitting the 1evers I to turn on their pivots. The projecting surfaces are thus made to recede from the wheels t, at which time the springs S will cause the blocks Q to spring outward from each other and free the point-threading tools R from contact with the screw. Upon the return of the base J, carrying the screw-clamp and point-threading tools, toward the head A, the arms h and levers I will assume their former position, the arms 7L being controlled by their springs, and the levers I being actuated by the wheels t striking their rear ends, the eft'ect being to throw the projecting surfaces at the front ends of the levers inward, as before.

Around the edge of the base E is formed a groove or trough, in which the liquid that the operator employs upon the screws being treat ed is placed. Y

The operation of the invention is as follows:

The screw being inserted in the head G, as indicated, the standards L are separated by the movement of the lever N and cams m, and moved so that the screw will be between the two sections of the screw-clamp O, when the lever is depressed and the standards L brought toward each other, which has the effect of closing the clamp upon the screw, the pointthreading toolsR being adjusted according to the size of the screw and the depth to be cnt. Motion is then imparted to the shaft B by a suitable belt acting upon the band-wheel D. The revolving movement of the screw, acting upon the threads of the screw-clam p, forces the slide J carrying the said clamp and the cuttingtools, forward between the standards H,where by the tools are caused to approach each other and thread the end of' the screw, the movement of the point-threading tools being regulated, in the manner above described, by the levers I and arms 7L. After the tools R have completed their incision they will spring out- Ward, as aforesaid, and permit the screw to be withdrawn. l

What I claim as my invention, and desire to sec-ure by Letters Patent, is

1. In a machine for threading the points of lag-screws, the clamping-jaws O, having a fcmale thread and mounted upon the sliding standards L, provided with the cam-plate M, and lever N, in combination with the sliding blocks Q, carrying the point-threading tools It, substantially as set forth.

2. In a machine for threading'the points of lag-se.ews, the blocks Q Q, having upon their outer edges the wheels t t, and carrying the point-threading tools R It, in combination with the sliding standards L L, springs S S, and pivoted former-levers I I, substantially as described.

3. In a machine for threading the 'points of lag-screws, the base Gr j', adjustable on the bed E, and the sliding base J, carrying the threaded clamping-jaws O O, in combination. with cam-plate M, lever N, blocks Q Q, carrying point-threading tools R It, springs S S,

IOD

IOS

IIO

and former-levers I I, substantially as specified.

4. In a machine for threading the points of lag-screws, the longitudinally-sliding base G f, guide K, carrying the blocks L L, and threaded screw-clamp O, in combination with blocks Q Q, carrying the point-threading tools, and having transverse movements toward and from each other, substantially as specified.

5. In a screw-threading machine, the combination of the sliding base J, the transverselysliding standards L, the screw-clamp O, the sliding blocks Q, and the point-threading tools R, the clamp and tools being capable ot'independent movements, substantially as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

HENRY E. COY.

Witnesses:

THos. E. Buanows, JOSEPH P. HENRY. 

